It used to take me 50 minutes to go 11 miles on 101/110 from studio city to downtown LA, so 20mph seems optimistic.
Heck, it wasn't even all that rare for it to take me 45 minutes to go 5 miles on 101 from Rengstorff Ave to Willow Rd in the Bay Area in 6pm rush hour just because of the exit.
It even once took me 2h to make it from Candlestick Park to the 101 after an NFL game.
So yeah, maybe 2 hours for a few miles isn't quite right, but I've experienced daily counterexamples to your 20mph number too.
It used to take me 50 minutes to go 11 miles on 101/110 from studio city to downtown LA, so 20mph seems optimistic.
Heck, it wasn't even all that rare for it to take me 45 minutes to go 5 miles on 101 from Rengstorff Ave to Willow Rd in the Bay Area in 6pm rush hour just because of the exit.
It even once took me 2h to make it from Candlestick Park to the 101 after an NFL game.
So yeah, maybe 2 hours for a few miles isn't quite right, but I've experienced daily counterexamples to your 20mph number too.
Usually the backup on the 101s doesn't start until around santa monica blvd and clears up after alvarado.
That being said, you also have a heavy rail alternative.